Crescent and star

The Islamic Crescent is a symbol consisting of a crescent with a star at the concave side. In its modern form, the star is usually shown with five points (though in earlier centuries a higher number of points was often used). The two signs together, or the crescent only, was long a symbol of Byzantium. Now it is often a symbol of Islam. It is seen on a number of different country flags such as Turkey.

Flag of Ottoman Empire was the first flag featuring a crescent with a star. Other states formerly part of the Ottoman Empire also used the symbol, so the symbol emerged into popular use.